JP6603139B2 - Temporary dome roof fixing structure and low temperature storage tank dome roof temporary fixing method - Google Patents

Description

  The present invention relates to a dome roof temporary fixing structure and a dome roof temporary fixing method for a low temperature storage tank.

  When constructing a flat bottom cylindrical low-temperature storage tank (for example, LNG tank) by the outer tank prior construction method, a concrete cylindrical liquid breakwater is constructed, and the outer tank bottom plate and the outer tank side plate are assembled inside the liquid breakwater. It is done. Next, a dome roof including an inner tank roof and an outer tank roof is assembled on the outer tank bottom plate, the dome roof is lifted by air lasing, and the dome roof is supported by pressurized air. The outer peripheral part is fixed to the top ring of the breakwater by welding.

  By the way, it may be difficult to weld the dome roof to the top ring while being supported by the pressurized air, and the dome roof is temporarily fixed to the liquid barrier and then welded to the top ring. Patent Document 1 discloses a structure in which a dome roof is temporarily fixed to a liquid barrier via a plurality of roof fixing beams disposed on the upper surface of the liquid barrier. The roof fixing beam is inserted through a gate-shaped fixing jig fixed to the upper surface of the liquid barrier by welding. A wedge member is inserted between the roof fixing beam and the gate-shaped fixing jig, and the roof fixing beam and the liquid breakwater are connected via a wedge action.

JP2013-238039A

  However, if the portal fixture is fixed in advance on the top of the breakwater, the direction of the work for inserting the roof fixing beam through the portal fixture and the direction of the drawing operation are regulated by the portal fixture. In some cases, work efficiency is reduced.

  The objective of this invention is providing the dome roof temporary fixing structure and the dome roof temporary fixing method which improved the workability | work of the temporary fixing of the dome roof.

  The dome roof temporary fixing structure according to the present invention is a dome roof temporary fixing structure for temporarily fixing a dome roof of a low-temperature storage tank to a liquid breakwater, and is disposed on an upper surface of the liquid barrier, and the roof bone of the dome roof A roof fixing beam combined with the roof, and a fixing jig on the liquid barrier that is detachably fixed to the upper surface of the liquid barrier so as to straddle the roof fixing beam, and connects the roof fixing beam to the liquid barrier Is provided corresponding to each of the plurality of roof bones. According to this structure, since the fixing jig on the breakwater can be freely attached to and detached from the breakwater, the work for arranging the roof fixing beam is not limited by the fixing jig on the breakwater, and workability is improved. Is excellent.

  Anchor bolts are embedded in the upper surface of the liquid breakwater, and the liquid breakwater fixing jig has a pair of leg portions straddling the roof fixing beam and a horizontal portion connecting the leg portions. A flange having a through-hole is formed at the lower end of the leg portion, and the anchoring jig on the liquid barrier is inserted into the through-hole and the flange contacts the liquid barrier. It may be fastened to the liquid breakwater via the anchor bolt in a contacted state. According to this structure, it is possible to simplify the structure for fixing the breakwater fixing jig to the breakwater.

  A recess may be formed on the top surface of the breakwater, and the tip of the anchor bolt may be accommodated in the recess. According to this structure, there is no fear that an operator may go to the anchor bolt and it is safe.

  The dome roof temporary fixing method according to the present invention is the dome roof temporary fixing method in which the outer periphery of the dome roof of the low-temperature storage tank is temporarily fixed to the liquid breakwater via the roof fixing beam. Disposing a fixing jig on the breakwater so as to straddle the roof fixing beam, fastening the fixing jig on the breakwater to the breakwater, and fixing the roof fixing beam And a step of inserting a wedge member between the fixing jigs on the breakwater, and each step is performed on a plurality of roof bones of the dome roof. According to this method, after the roof fixing beam is disposed, the fixing jig is installed and temporarily fixed by the wedge member. Therefore, the work for arranging the roof fixing beam is not limited by the fixing jig on the breakwater, and the workability is excellent.

  ADVANTAGE OF THE INVENTION According to this invention, the dome roof temporary fixing structure excellent in workability | operativity and the dome roof temporary fixing method can be provided.

It is a schematic sectional drawing of a low-temperature storage tank. It is a fragmentary top view which shows arrangement | positioning of the roof bone | frame of a dome roof. It is sectional drawing of the principal part of the dome roof temporary fixing structure of this invention. It is a top view of the principal part of a dome roof temporary fixing structure. It is the VV sectional view taken on the line of FIG. It is sectional drawing of the upper end side part of a breakwater, an outer tank roof, etc. in the dome roof floating process of the dome roof temporary fixing method of this invention. It is sectional drawing, such as an upper end side part of a breakwater in the roof fixing beam installation process of the dome roof temporary fixing method of this invention, and an outer tank roof. It is sectional drawing, such as the upper end side part of a liquid-breakwater in the jig | tool fastening process of the dome roof temporary fixing method of this invention, and an outer tank roof.

  Hereinafter, a dome roof temporary fixing structure and a dome roof temporary fixing method according to the present invention will be described based on embodiments.

  When a flat bottom cylindrical low-temperature storage tank (for example, LNG tank) is constructed by the outer tank prior construction method, a concrete cylindrical breakwater is first constructed. Next, the outer tank bottom plate and the outer tank side plate are assembled inside the liquid barrier. Furthermore, the dome roof including the inner tank roof and the outer tank roof is assembled on the outer tank bottom plate. The dome roof is lifted by air lasing, temporarily fixed to the breakwater with the dome roof supported by pressurized air, and the outer periphery of the outer tank roof is fixed to the top ring of the breakwater by welding. The

  As shown in FIG. 1, the low temperature storage tank T includes a foundation concrete 1, a concrete liquid barrier 2, a steel outer tank bottom plate 3, an outer tank side plate 4, and a dome roof 5 inside the liquid barrier 2. And a top ring 6 and the like. In a state where the dome roof 5 lifted by air aging is temporarily fixed to the liquid breakwater 2, a dome roof temporary fixing structure 7 described later is further provided. As shown in FIGS. 1 and 2, the dome roof 5 has a plurality of roof bones 10 and 11 extending radially in the radial direction, annular reinforcing bones 12 to 17, an inner tank roof 5 a fixed to them, an outer tank roof 5 b and the like. including. An annular seal 8 that seals pressurized air is attached to the outer periphery of the dome roof 5 via an annular attachment member 9.

Next, the dome roof temporary fixing structure 7 will be described.
As shown in FIGS. 3 to 5, the dome roof temporary fixing structure 7 according to the present embodiment includes a roof fixing beam 18 disposed on the upper surface of the liquid barrier 2 and the roof bones 10 and 11. The roof bone fixing jig 19 for supporting the roof, a pair of anchor bolt groups 20A and 20B embedded in the upper surface of the breakwater 2, and the roof fixed On the upper surface of the liquid breakwater 2, a liquid breakwater fixing jig 21 or the like for supporting the beam 18 is provided corresponding to each of the plurality of roof bones 10 and 11 of the dome roof 5. Note that the roof fixing beams 18 and the like do not necessarily have to be provided so as to correspond to all the roof bones 10 and 11, and correspond to a part of the roof bones 10 and 11 within a range where there is no problem in strength. It may be provided.

  The roof bone fixing jig 19 is welded to the upper surfaces of the roof bones 10 and 11 exposed from the opening 5c of the outer tub roof 5b and extends vertically upward, and radially outward from the upper end of the leg portion 19a. And a horizontal portion 19b extending in the direction. A receiving plate 19c serving as a receiving surface for the roof fixing beam 18 is welded to the outer surface of the leg portion 19a. An open space S is formed on the outer side in the radial direction between the upper surfaces of the roof bones 10 and 11 and the lower surface of the horizontal portion 19 b of the roof bone fixing jig 19.

  The roof fixing beam 18 is H-shaped steel, and is disposed on the upper surface of the breakwater 2 with a pair of flanges 18a and 18b facing up and down. The portion where the roof fixing beam 18 abuts against the roof bones 10 and 11 is formed with an inclined flange 18 c along the upper surface of the roof bones 10 and 11, and a face plate 18 d at the radially inner end of the roof fixing beam 18. Are welded.

  Each roof fixing beam 18 is disposed at a circumferential position corresponding to the roof bones 10 and 11, and the longitudinal direction thereof is substantially the same as the direction in which the plan view roof bones 10 and 11 extend, that is, the radial direction of the dome roof 5. Match. A part of the inside of the roof fixing beam 18 in the radial direction protrudes from the liquid breakwater 2, and a part of the inclined flange 18 c is in contact with the upper surfaces of the roof bones 10 and 11. The roof fixing beam 18 is inserted into the space S from the outside in the radial direction, and the face plate 18c is in contact with the receiving plate 19c. By inserting the wedge member 20 into the gap formed between the upper flange 18a of the roof fixing beam 18 and the horizontal portion 19b of the roof bone fixing jig 19, the roof bones 10 and 11 and the roof fixing beam 18 are connected. They are connected by wedge action. A steel slide plate 18e is welded to the lower surface of the lower flange 18b of the roof fixing beam 18.

  The breakwater fixing jig 21 has a pair of leg portions 21c and 21d each having rectangular flanges 21a and 21b, and a horizontal beam portion 21e that couples the pair of leg portions 21c and 21d. The roof fixing beam 18 is disposed so as to straddle the radially outer end side. Each flange 21a, 21b is formed with a plurality of through holes. The ends of the anchor bolts constituting the pair of anchor bolt groups 20A and 20B are inserted into the through holes, respectively. The flanges 21 a and 21 b are fastened to the upper surface of the liquid barrier 2 by tightening the nut from the tip side of each anchor bolt.

  By inserting the wedge member 22 between the upper flange 18a of the roof fixing beam 18 and the horizontal beam portion 21e of the fixing jig 21 on the liquid barrier, the roof fixing beam 18 and the liquid barrier 2 are combined. Yes. Since the so-called gate-shaped liquid breakwater fixing jig 21 fixed to the liquid breakwater 2 is employed and the wedge action is interposed, the roof fixing beam 18 is firmly coupled to the liquid breakwater 2. Yes.

  Rectangular recesses 23A, 23B are formed on the top surface of the breakwater 2 at positions corresponding to the pair of anchor bolt groups 20A, 20B, and a pair of flanges 21a, 21b is accommodated in the recesses 23A and 23B, respectively. Part of the tip side of the pair of anchor bolt groups 20A and 20B protrudes from the bottom surfaces of the recesses 23A and 23B, respectively. In the present embodiment, the tip ends of the anchor bolt groups 20 </ b> A and 20 </ b> B are located at the same height as the upper surface of the liquid barrier 2. It should be noted that the tip ends of the anchor bolt groups 20A and 20B are the same height as or lower than the top surface of the breakwater 2 as in the present embodiment, that is, the tip ends of the anchor bolt groups are recessed 23A, It is desirable that it is accommodated in 23B from the viewpoint of worker safety.

  A plurality of floor boards 25 extending along the roof fixing beam 18 are laid on the upper surface of the liquid breakwater 2, and each floor board 25 is welded to the top ring 6. A stopper member 26 is welded radially outward from the roof fixing beam 18 of each floor plate 25. Between the stopper member 26 and the roof fixing beam 18, a spacer member 27 including a spacer block 27a and a wedge body 27b is fitted. In this way, the movement of the roof fixing beam 18 in the radial direction is restricted. The stopper member 26, the spacer block 27a, and the wedge body 27b are not essential components.

  With the structure as described above, the dome roof 5 is provisionally fixed to the liquid barrier 2 via the roof fixing beam 18. In the dome roof temporary fixing structure 7, the fixing jig 21 on the breakwater is fixed to the breakwater 2 in a detachable manner. It is not limited by the tool 21 and is excellent in workability.

  Next, a method of temporarily fixing the dome roof 5 to the liquid barrier 2 (dome roof temporary fixing method) will be described.

  First, as shown in FIGS. 6 and 7, the dome roof 5 is brought into contact with or close to the top ring 6 from the lower side in a state where the air lasing levitation force is applied to the dome roof 5 (dome roof levitation process).

  Next, the roof fixing beam 18 is disposed on the top surface of the liquid barrier 2 (roof fixing beam installation step). The roof fixing beam 18 is arranged so that the flanges 18 a and 18 b face upward and the longitudinal direction of the roof fixing beam 18 is along the radial direction of the dome roof 5. A part of the inner side of the roof fixing beam 18 in the radial direction is protruded from the liquid breakwater 2 and a part of the inclined flange 18c is brought into contact with the upper surface of the roof bones 10 and 11, and the face plate 18d is fixed on the roof bone. The tool 19 is brought into contact with the receiving plate 19c.

  Next, as shown in FIG. 8, the fixing jig 21 on the breakwater is fixed to the breakwater 2 (jig fastening process). A liquid breakwater fixing jig 21 is installed so as to straddle the radially outer end side of the roof fixing beam 18, and a pair of anchors corresponding to the through holes of the flanges 21 a and 21 b of the liquid breakwater fixing jig 21 are provided. The bolt groups 20 </ b> A and 20 </ b> B are inserted, and the liquid breakwater fixing jig 21 is fastened to the liquid breakwater 2 with bolts and nuts.

  Next, as shown in FIGS. 3 to 5, the roof fixing beam 18 is fixed (beam fixing step). A spacer member 27 is inserted between the radially outer end portion of the roof fixing beam 18 and the stopper member 26, and between the radial inner end portion of the roof fixing beam 18 and the horizontal portion 19 b of the roof bone fixing jig 19. In addition, wedge members 22 and 23 are inserted between the roof fixing beam 18 and the horizontal beam portion 21c of the liquid barrier embankment fixing jig 21, respectively.

  The spacer member 27 is inserted by inserting two pairs of wedge bodies 27b between the spacer block 27a and the radially outer ends of the roof fixing beam 18 in a state where the spacer block 27a is in contact with the stopper member 26. Do. A wedge member 22 is firmly inserted between the one end of the roof fixing beam 18 and the horizontal part 19b of the roof bone fixing jig 19 so that the roof fixing beam 18 and the horizontal beam of the liquid breakwater fixing jig 21 are fixed. Between the portions 21e, the wedge member 23 is firmly fitted from the radially inner side.

  By performing the above process on all the roof bones 10 and 11 of the dome roof 5, the dome roof 5 is temporarily fixed with the liquid barrier 2 and the dome roof temporary fixing structure 7 being supported. After temporarily fixing the dome roof 5, the pressurized air inside the breakwater 2 is removed, and the outer rim roof 5 b of the dome roof 5 is welded to the top ring 6 over the entire circumference. Thus, after the dome roof 5 need not be supported by the dome roof temporary fixing structure 7, the wedge members 22, 23, the spacer member 27, the liquid barrier fixing jig 21, the roof fixing beam 18, and the roof bone fixing treatment are performed. The tool 19, the floor plate 24, etc. shall be removed. The recesses 24 </ b> A and 24 </ b> B may be covered with a plate member or the like except when fixing the liquid barrier embankment fixing jig 21.

  According to the dome roof temporary fixing structure and the dome roof temporary fixing method described above, the operation of disposing the roof fixing beam 18 is not limited by the fixing jig 21 on the breakwater, so that the dome roof is temporarily fixed. The workability can be improved.

An example in which the embodiment is partially changed will be described.
[1] When a checker plate is laid on the entire upper surface of the liquid barrier 2, the checker plate can be used as the laying plate 25. In this case, the positions corresponding to the anchor bolt groups 20 </ b> A and 20 </ b> B are made openable, and are opened when the dome roof 5 is temporarily fixed, and the liquid barrier embankment fixing jig 21 is fixed.
[2] The number of the on-water breakwater fixing jigs 21 corresponding to the roof bones 10 and 11 is not limited to one set, and two or more sets may be provided.
[3] The width of the spacer block 27a of the spacer member 27 may be increased, and a pair of wedge bodies 27b may be used instead of the two pairs of wedge bodies 27b.
[4] In addition, those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention.

T Low temperature storage tank 2 Liquid breakwater 5 Dome roof 6 Top ring 7 Dome roof temporary fixing structure 10, 11 Roof bone 18 Roof fixing beam 19 Roof bone fixing jig 19c Receiving plate (receiving surface)
20A, 20B Anchor bolt group 21 Liquid barrier embankment fixing jigs 22, 23 Wedge members 24A, 24B Recess 25 Laying plate 26 Stopper member 27 Spacer member

Claims (4)

In the dome roof temporary fixing structure that temporarily fixes the dome roof of the low temperature storage tank to the liquid breakwater,
The dome roof includes a plurality of roof bones extending radially,
A roof fixing beam disposed on an upper surface of the liquid breakwater and coupled to a roof bone of the dome roof, and removably fixed to the upper surface of the liquid breakwater so as to straddle the roof fixing beam, A dome roof temporary fixing structure, comprising: a fixing dam fixing jig for connecting a fixing beam to the liquid barrier, corresponding to each of the plurality of roof bones. Anchor bolts are embedded on the top surface of the liquid breakwater,
The above-mentioned liquid breakwater fixing jig has a pair of leg portions straddling the roof fixing beam and a horizontal portion connecting the leg portions,
A flange having a through hole is formed at the lower end of the leg,
The fixture on the breakwater is fastened to the breakwater via the anchor bolt in a state where the anchor bolt is inserted into the through hole and the flange is in contact with the upper surface of the breakwater. The dome roof temporary fixing structure according to claim 1, wherein the dome roof is temporarily fixed. A recess is formed on the top surface of the liquid breakwater,
The dome roof temporary fixing structure according to claim 2, wherein a tip of the anchor bolt is accommodated in the recess. In the dome roof temporary fixing method of temporarily fixing the dome roof of the low temperature storage tank to the liquid breakwater via the roof fixing beam,
Arranging the roof fixing beam on the liquid breakwater;
Installing a fixing jig on the breakwater so as to straddle the roof fixing beam, and fastening the fixing jig on the breakwater to the breakwater;
Including a step of inserting a wedge member between the roof fixing beam and the fixing jig on the breakwater,
A method for temporarily fixing a dome roof, wherein the steps are performed on a plurality of roof bones of the dome roof.